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The isocyanates of silicon (CH 3 ) 2 Si(NCO) 2  and Si(NCO)4 react with CH 3 N[Sn(CH 3 ) 3 ] 2  and N[Sn(CH 3 ) 3 ] 3  to yield the cyclic derivatives 2a-2b as well as the spiro compound 3. The structures of the compounds are discussed on the basis of  1 H NMR and IR data. Mass spectra are not conclusive for assigning a certain structure. SO 2 (NCO) 2  and (CH 3 ) 3 Si-S-Si(CH 3 ) 3  form a cyclic compound 4 which contains two sulfur atoms of coordination number two and four. The results of the mass spectra can be interpreted by assuming that a rearrangement occurred. 4 hydrolyses under formation of 5.

zeitschrift für naturforschung b

Über das Verhalten von silicium- und zinnorganischen Verbindungen bei der Synthese von Heterocyclen / On the Behaviour of Silicon and Tin Organic Compounds in the Synthesis of Heterocycles